[mediagoblin.git] / mediagoblin / tests / test_exif.py

# GNU MediaGoblin -- federated, autonomous media hosting
# Copyright (C) 2011, 2012 MediaGoblin contributors.  See AUTHORS.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

import os
try:
    from PIL import Image
except ImportError:
    import Image

from mediagoblin.tools.exif import exif_fix_image_orientation, \
    extract_exif, clean_exif, get_gps_data, get_useful
from .resources import GOOD_JPG, EMPTY_JPG, BAD_JPG, GPS_JPG


def assert_in(a, b):
    assert a in b, "%r not in %r" % (a, b)


def test_exif_extraction():
    '''
    Test EXIF extraction from a good image
    '''
    result = extract_exif(GOOD_JPG)
    clean = clean_exif(result)
    useful = get_useful(clean)
    gps = get_gps_data(result)

    # Do we have the result?
    assert len(result) == 55

    # Do we have clean data?
    assert len(clean) == 53

    # GPS data?
    assert gps == {}

    # Do we have the "useful" tags?
    assert useful == {'EXIF CVAPattern': {'field_length': 8,
                     'field_offset': 26224,
                     'field_type': 7,
                     'printable': u'[0, 2, 0, 2, 1, 2, 0, 1]',
                     'tag': 41730,
                     'values': [0, 2, 0, 2, 1, 2, 0, 1]},
 'EXIF ColorSpace': {'field_length': 2,
                     'field_offset': 476,
                     'field_type': 3,
                     'printable': u'sRGB',
                     'tag': 40961,
                     'values': [1]},
 'EXIF ComponentsConfiguration': {'field_length': 4,
                                  'field_offset': 308,
                                  'field_type': 7,
                                  'printable': u'YCbCr',
                                  'tag': 37121,
                                  'values': [1, 2, 3, 0]},
 'EXIF CompressedBitsPerPixel': {'field_length': 8,
                                 'field_offset': 756,
                                 'field_type': 5,
                                 'printable': u'4',
                                 'tag': 37122,
                                 'values': [[4, 1]]},
 'EXIF Contrast': {'field_length': 2,
                   'field_offset': 656,
                   'field_type': 3,
                   'printable': u'Soft',
                   'tag': 41992,
                   'values': [1]},
 'EXIF CustomRendered': {'field_length': 2,
                         'field_offset': 572,
                         'field_type': 3,
                         'printable': u'Normal',
                         'tag': 41985,
                         'values': [0]},
 'EXIF DateTimeDigitized': {'field_length': 20,
                            'field_offset': 736,
                            'field_type': 2,
                            'printable': u'2011:06:22 12:20:33',
                            'tag': 36868,
                            'values': u'2011:06:22 12:20:33'},
 'EXIF DateTimeOriginal': {'field_length': 20,
                           'field_offset': 716,
                           'field_type': 2,
                           'printable': u'2011:06:22 12:20:33',
                           'tag': 36867,
                           'values': u'2011:06:22 12:20:33'},
 'EXIF DigitalZoomRatio': {'field_length': 8,
                           'field_offset': 26232,
                           'field_type': 5,
                           'printable': u'1',
                           'tag': 41988,
                           'values': [[1, 1]]},
 'EXIF ExifImageLength': {'field_length': 2,
                          'field_offset': 500,
                          'field_type': 3,
                          'printable': u'2592',
                          'tag': 40963,
                          'values': [2592]},
 'EXIF ExifImageWidth': {'field_length': 2,
                         'field_offset': 488,
                         'field_type': 3,
                         'printable': u'3872',
                         'tag': 40962,
                         'values': [3872]},
 'EXIF ExifVersion': {'field_length': 4,
                      'field_offset': 272,
                      'field_type': 7,
                      'printable': u'0221',
                      'tag': 36864,
                      'values': [48, 50, 50, 49]},
 'EXIF ExposureBiasValue': {'field_length': 8,
                            'field_offset': 764,
                            'field_type': 10,
                            'printable': u'0',
                            'tag': 37380,
                            'values': [[0, 1]]},
 'EXIF ExposureMode': {'field_length': 2,
                       'field_offset': 584,
                       'field_type': 3,
                       'printable': u'Manual Exposure',
                       'tag': 41986,
                       'values': [1]},
 'EXIF ExposureProgram': {'field_length': 2,
                          'field_offset': 248,
                          'field_type': 3,
                          'printable': u'Manual',
                          'tag': 34850,
                          'values': [1]},
 'EXIF ExposureTime': {'field_length': 8,
                       'field_offset': 700,
                       'field_type': 5,
                       'printable': u'1/125',
                       'tag': 33434,
                       'values': [[1, 125]]},
 'EXIF FNumber': {'field_length': 8,
                  'field_offset': 708,
                  'field_type': 5,
                  'printable': u'10',
                  'tag': 33437,
                  'values': [[10, 1]]},
 'EXIF FileSource': {'field_length': 1,
                     'field_offset': 536,
                     'field_type': 7,
                     'printable': u'Digital Camera',
                     'tag': 41728,
                     'values': [3]},
 'EXIF Flash': {'field_length': 2,
                'field_offset': 380,
                'field_type': 3,
                'printable': u'Flash did not fire',
                'tag': 37385,
                'values': [0]},
 'EXIF FlashPixVersion': {'field_length': 4,
                          'field_offset': 464,
                          'field_type': 7,
                          'printable': u'0100',
                          'tag': 40960,
                          'values': [48, 49, 48, 48]},
 'EXIF FocalLength': {'field_length': 8,
                      'field_offset': 780,
                      'field_type': 5,
                      'printable': u'18',
                      'tag': 37386,
                      'values': [[18, 1]]},
 'EXIF FocalLengthIn35mmFilm': {'field_length': 2,
                                'field_offset': 620,
                                'field_type': 3,
                                'printable': u'27',
                                'tag': 41989,
                                'values': [27]},
 'EXIF GainControl': {'field_length': 2,
                      'field_offset': 644,
                      'field_type': 3,
                      'printable': u'None',
                      'tag': 41991,
                      'values': [0]},
 'EXIF ISOSpeedRatings': {'field_length': 2,
                          'field_offset': 260,
                          'field_type': 3,
                          'printable': u'100',
                          'tag': 34855,
                          'values': [100]},
 'EXIF InteroperabilityOffset': {'field_length': 4,
                                 'field_offset': 512,
                                 'field_type': 4,
                                 'printable': u'26240',
                                 'tag': 40965,
                                 'values': [26240]},
 'EXIF LightSource': {'field_length': 2,
                      'field_offset': 368,
                      'field_type': 3,
                      'printable': u'Unknown',
                      'tag': 37384,
                      'values': [0]},
 'EXIF MaxApertureValue': {'field_length': 8,
                           'field_offset': 772,
                           'field_type': 5,
                           'printable': u'18/5',
                           'tag': 37381,
                           'values': [[18, 5]]},
 'EXIF MeteringMode': {'field_length': 2,
                       'field_offset': 356,
                       'field_type': 3,
                       'printable': u'Pattern',
                       'tag': 37383,
                       'values': [5]},
 'EXIF Saturation': {'field_length': 2,
                     'field_offset': 668,
                     'field_type': 3,
                     'printable': u'Normal',
                     'tag': 41993,
                     'values': [0]},
 'EXIF SceneCaptureType': {'field_length': 2,
                           'field_offset': 632,
                           'field_type': 3,
                           'printable': u'Standard',
                           'tag': 41990,
                           'values': [0]},
 'EXIF SceneType': {'field_length': 1,
                    'field_offset': 548,
                    'field_type': 7,
                    'printable': u'Directly Photographed',
                    'tag': 41729,
                    'values': [1]},
 'EXIF SensingMethod': {'field_length': 2,
                        'field_offset': 524,
                        'field_type': 3,
                        'printable': u'One-chip color area',
                        'tag': 41495,
                        'values': [2]},
 'EXIF Sharpness': {'field_length': 2,
                    'field_offset': 680,
                    'field_type': 3,
                    'printable': u'Normal',
                    'tag': 41994,
                    'values': [0]},
 'EXIF SubSecTime': {'field_length': 3,
                     'field_offset': 428,
                     'field_type': 2,
                     'printable': u'10',
                     'tag': 37520,
                     'values': u'10'},
 'EXIF SubSecTimeDigitized': {'field_length': 3,
                              'field_offset': 452,
                              'field_type': 2,
                              'printable': u'10',
                              'tag': 37522,
                              'values': u'10'},
 'EXIF SubSecTimeOriginal': {'field_length': 3,
                             'field_offset': 440,
                             'field_type': 2,
                             'printable': u'10',
                             'tag': 37521,
                             'values': u'10'},
 'EXIF SubjectDistanceRange': {'field_length': 2,
                               'field_offset': 692,
                               'field_type': 3,
                               'printable': u'0',
                               'tag': 41996,
                               'values': [0]},
 'EXIF WhiteBalance': {'field_length': 2,
                       'field_offset': 596,
                       'field_type': 3,
                       'printable': u'Auto',
                       'tag': 41987,
                       'values': [0]},
 'Image DateTime': {'field_length': 20,
                    'field_offset': 194,
                    'field_type': 2,
                    'printable': u'2011:06:22 12:20:33',
                    'tag': 306,
                    'values': u'2011:06:22 12:20:33'},
 'Image ExifOffset': {'field_length': 4,
                      'field_offset': 126,
                      'field_type': 4,
                      'printable': u'214',
                      'tag': 34665,
                      'values': [214]},
 'Image Make': {'field_length': 18,
                'field_offset': 134,
                'field_type': 2,
                'printable': u'NIKON CORPORATION',
                'tag': 271,
                'values': u'NIKON CORPORATION'},
 'Image Model': {'field_length': 10,
                 'field_offset': 152,
                 'field_type': 2,
                 'printable': u'NIKON D80',
                 'tag': 272,
                 'values': u'NIKON D80'},
 'Image Orientation': {'field_length': 2,
                       'field_offset': 42,
                       'field_type': 3,
                       'printable': u'Rotated 90 CCW',
                       'tag': 274,
                       'values': [6]},
 'Image ResolutionUnit': {'field_length': 2,
                          'field_offset': 78,
                          'field_type': 3,
                          'printable': u'Pixels/Inch',
                          'tag': 296,
                          'values': [2]},
 'Image Software': {'field_length': 15,
                    'field_offset': 178,
                    'field_type': 2,
                    'printable': u'Shotwell 0.9.3',
                    'tag': 305,
                    'values': u'Shotwell 0.9.3'},
 'Image XResolution': {'field_length': 8,
                       'field_offset': 162,
                       'field_type': 5,
                       'printable': u'300',
                       'tag': 282,
                       'values': [[300, 1]]},
 'Image YCbCrPositioning': {'field_length': 2,
                            'field_offset': 114,
                            'field_type': 3,
                            'printable': u'Co-sited',
                            'tag': 531,
                            'values': [2]},
 'Image YResolution': {'field_length': 8,
                       'field_offset': 170,
                       'field_type': 5,
                       'printable': u'300',
                       'tag': 283,
                       'values': [[300, 1]]},
 'Thumbnail Compression': {'field_length': 2,
                           'field_offset': 26280,
                           'field_type': 3,
                           'printable': u'JPEG (old-style)',
                           'tag': 259,
                           'values': [6]},
 'Thumbnail ResolutionUnit': {'field_length': 2,
                              'field_offset': 26316,
                              'field_type': 3,
                              'printable': u'Pixels/Inch',
                              'tag': 296,
                              'values': [2]},
 'Thumbnail XResolution': {'field_length': 8,
                           'field_offset': 26360,
                           'field_type': 5,
                           'printable': u'300',
                           'tag': 282,
                           'values': [[300, 1]]},
 'Thumbnail YCbCrPositioning': {'field_length': 2,
                                'field_offset': 26352,
                                'field_type': 3,
                                'printable': u'Co-sited',
                                'tag': 531,
                                'values': [2]},
 'Thumbnail YResolution': {'field_length': 8,
                           'field_offset': 26368,
                           'field_type': 5,
                           'printable': u'300',
                           'tag': 283,
                           'values': [[300, 1]]}}


def test_exif_image_orientation():
    '''
    Test image reorientation based on EXIF data
    '''
    result = extract_exif(GOOD_JPG)

    image = exif_fix_image_orientation(
        Image.open(GOOD_JPG),
        result)

    # Are the dimensions correct?
    assert image.size == (428, 640)

    # If this pixel looks right, the rest of the image probably will too.
    assert_in(image.getdata()[10000],
              ((41, 28, 11), (43, 27, 11))
              )


def test_exif_no_exif():
    '''
    Test an image without exif
    '''
    result = extract_exif(EMPTY_JPG)
    clean = clean_exif(result)
    useful = get_useful(clean)
    gps = get_gps_data(result)

    assert result == {}
    assert clean == {}
    assert gps == {}
    assert useful == {}


def test_exif_bad_image():
    '''
    Test EXIF extraction from a faithful, but bad image
    '''
    result = extract_exif(BAD_JPG)
    clean = clean_exif(result)
    useful = get_useful(clean)
    gps = get_gps_data(result)

    assert result == {}
    assert clean == {}
    assert gps == {}
    assert useful == {}


def test_exif_gps_data():
    '''
    Test extractiion of GPS data
    '''
    result = extract_exif(GPS_JPG)
    gps = get_gps_data(result)

    assert gps == {
        'latitude': 59.336666666666666,
        'direction': 25.674046740467404,
        'altitude': 37.64365671641791,
        'longitude': 18.016166666666667}
Commit	Line	Data
	1	# GNU MediaGoblin -- federated, autonomous media hosting
	2	# Copyright (C) 2011, 2012 MediaGoblin contributors. See AUTHORS.
	3	#
	4	# This program is free software: you can redistribute it and/or modify
	5	# it under the terms of the GNU Affero General Public License as published by
	6	# the Free Software Foundation, either version 3 of the License, or
	7	# (at your option) any later version.
	8	#
	9	# This program is distributed in the hope that it will be useful,
	10	# but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	# GNU Affero General Public License for more details.
	13	#
	14	# You should have received a copy of the GNU Affero General Public License
	15	# along with this program. If not, see <http://www.gnu.org/licenses/>.
	16
	17	import os
	18	try:
	19	from PIL import Image
	20	except ImportError:
	21	import Image
	22
	23	from mediagoblin.tools.exif import exif_fix_image_orientation, \
	24	extract_exif, clean_exif, get_gps_data, get_useful
	25	from .resources import GOOD_JPG, EMPTY_JPG, BAD_JPG, GPS_JPG
	26
	27
	28	def assert_in(a, b):
	29	assert a in b, "%r not in %r" % (a, b)
	30
	31
	32	def test_exif_extraction():
	33	'''
	34	Test EXIF extraction from a good image
	35	'''
	36	result = extract_exif(GOOD_JPG)
	37	clean = clean_exif(result)
	38	useful = get_useful(clean)
	39	gps = get_gps_data(result)
	40
	41	# Do we have the result?
	42	assert len(result) == 55
	43
	44	# Do we have clean data?
	45	assert len(clean) == 53
	46
	47	# GPS data?
	48	assert gps == {}
	49
	50	# Do we have the "useful" tags?
	51	assert useful == {'EXIF CVAPattern': {'field_length': 8,
	52	'field_offset': 26224,
	53	'field_type': 7,
	54	'printable': u'[0, 2, 0, 2, 1, 2, 0, 1]',
	55	'tag': 41730,
	56	'values': [0, 2, 0, 2, 1, 2, 0, 1]},
	57	'EXIF ColorSpace': {'field_length': 2,
	58	'field_offset': 476,
	59	'field_type': 3,
	60	'printable': u'sRGB',
	61	'tag': 40961,
	62	'values': [1]},
	63	'EXIF ComponentsConfiguration': {'field_length': 4,
	64	'field_offset': 308,
	65	'field_type': 7,
	66	'printable': u'YCbCr',
	67	'tag': 37121,
	68	'values': [1, 2, 3, 0]},
	69	'EXIF CompressedBitsPerPixel': {'field_length': 8,
	70	'field_offset': 756,
	71	'field_type': 5,
	72	'printable': u'4',
	73	'tag': 37122,
	74	'values': [[4, 1]]},
	75	'EXIF Contrast': {'field_length': 2,
	76	'field_offset': 656,
	77	'field_type': 3,
	78	'printable': u'Soft',
	79	'tag': 41992,
	80	'values': [1]},
	81	'EXIF CustomRendered': {'field_length': 2,
	82	'field_offset': 572,
	83	'field_type': 3,
	84	'printable': u'Normal',
	85	'tag': 41985,
	86	'values': [0]},
	87	'EXIF DateTimeDigitized': {'field_length': 20,
	88	'field_offset': 736,
	89	'field_type': 2,
	90	'printable': u'2011:06:22 12:20:33',
	91	'tag': 36868,
	92	'values': u'2011:06:22 12:20:33'},
	93	'EXIF DateTimeOriginal': {'field_length': 20,
	94	'field_offset': 716,
	95	'field_type': 2,
	96	'printable': u'2011:06:22 12:20:33',
	97	'tag': 36867,
	98	'values': u'2011:06:22 12:20:33'},
	99	'EXIF DigitalZoomRatio': {'field_length': 8,
	100	'field_offset': 26232,
	101	'field_type': 5,
	102	'printable': u'1',
	103	'tag': 41988,
	104	'values': [[1, 1]]},
	105	'EXIF ExifImageLength': {'field_length': 2,
	106	'field_offset': 500,
	107	'field_type': 3,
	108	'printable': u'2592',
	109	'tag': 40963,
	110	'values': [2592]},
	111	'EXIF ExifImageWidth': {'field_length': 2,
	112	'field_offset': 488,
	113	'field_type': 3,
	114	'printable': u'3872',
	115	'tag': 40962,
	116	'values': [3872]},
	117	'EXIF ExifVersion': {'field_length': 4,
	118	'field_offset': 272,
	119	'field_type': 7,
	120	'printable': u'0221',
	121	'tag': 36864,
	122	'values': [48, 50, 50, 49]},
	123	'EXIF ExposureBiasValue': {'field_length': 8,
	124	'field_offset': 764,
	125	'field_type': 10,
	126	'printable': u'0',
	127	'tag': 37380,
	128	'values': [[0, 1]]},
	129	'EXIF ExposureMode': {'field_length': 2,
	130	'field_offset': 584,
	131	'field_type': 3,
	132	'printable': u'Manual Exposure',
	133	'tag': 41986,
	134	'values': [1]},
	135	'EXIF ExposureProgram': {'field_length': 2,
	136	'field_offset': 248,
	137	'field_type': 3,
	138	'printable': u'Manual',
	139	'tag': 34850,
	140	'values': [1]},
	141	'EXIF ExposureTime': {'field_length': 8,
	142	'field_offset': 700,
	143	'field_type': 5,
	144	'printable': u'1/125',
	145	'tag': 33434,
	146	'values': [[1, 125]]},
	147	'EXIF FNumber': {'field_length': 8,
	148	'field_offset': 708,
	149	'field_type': 5,
	150	'printable': u'10',
	151	'tag': 33437,
	152	'values': [[10, 1]]},
	153	'EXIF FileSource': {'field_length': 1,
	154	'field_offset': 536,
	155	'field_type': 7,
	156	'printable': u'Digital Camera',
	157	'tag': 41728,
	158	'values': [3]},
	159	'EXIF Flash': {'field_length': 2,
	160	'field_offset': 380,
	161	'field_type': 3,
	162	'printable': u'Flash did not fire',
	163	'tag': 37385,
	164	'values': [0]},
	165	'EXIF FlashPixVersion': {'field_length': 4,
	166	'field_offset': 464,
	167	'field_type': 7,
	168	'printable': u'0100',
	169	'tag': 40960,
	170	'values': [48, 49, 48, 48]},
	171	'EXIF FocalLength': {'field_length': 8,
	172	'field_offset': 780,
	173	'field_type': 5,
	174	'printable': u'18',
	175	'tag': 37386,
	176	'values': [[18, 1]]},
	177	'EXIF FocalLengthIn35mmFilm': {'field_length': 2,
	178	'field_offset': 620,
	179	'field_type': 3,
	180	'printable': u'27',
	181	'tag': 41989,
	182	'values': [27]},
	183	'EXIF GainControl': {'field_length': 2,
	184	'field_offset': 644,
	185	'field_type': 3,
	186	'printable': u'None',
	187	'tag': 41991,
	188	'values': [0]},
	189	'EXIF ISOSpeedRatings': {'field_length': 2,
	190	'field_offset': 260,
	191	'field_type': 3,
	192	'printable': u'100',
	193	'tag': 34855,
	194	'values': [100]},
	195	'EXIF InteroperabilityOffset': {'field_length': 4,
	196	'field_offset': 512,
	197	'field_type': 4,
	198	'printable': u'26240',
	199	'tag': 40965,
	200	'values': [26240]},
	201	'EXIF LightSource': {'field_length': 2,
	202	'field_offset': 368,
	203	'field_type': 3,
	204	'printable': u'Unknown',
	205	'tag': 37384,
	206	'values': [0]},
	207	'EXIF MaxApertureValue': {'field_length': 8,
	208	'field_offset': 772,
	209	'field_type': 5,
	210	'printable': u'18/5',
	211	'tag': 37381,
	212	'values': [[18, 5]]},
	213	'EXIF MeteringMode': {'field_length': 2,
	214	'field_offset': 356,
	215	'field_type': 3,
	216	'printable': u'Pattern',
	217	'tag': 37383,
	218	'values': [5]},
	219	'EXIF Saturation': {'field_length': 2,
	220	'field_offset': 668,
	221	'field_type': 3,
	222	'printable': u'Normal',
	223	'tag': 41993,
	224	'values': [0]},
	225	'EXIF SceneCaptureType': {'field_length': 2,
	226	'field_offset': 632,
	227	'field_type': 3,
	228	'printable': u'Standard',
	229	'tag': 41990,
	230	'values': [0]},
	231	'EXIF SceneType': {'field_length': 1,
	232	'field_offset': 548,
	233	'field_type': 7,
	234	'printable': u'Directly Photographed',
	235	'tag': 41729,
	236	'values': [1]},
	237	'EXIF SensingMethod': {'field_length': 2,
	238	'field_offset': 524,
	239	'field_type': 3,
	240	'printable': u'One-chip color area',
	241	'tag': 41495,
	242	'values': [2]},
	243	'EXIF Sharpness': {'field_length': 2,
	244	'field_offset': 680,
	245	'field_type': 3,
	246	'printable': u'Normal',
	247	'tag': 41994,
	248	'values': [0]},
	249	'EXIF SubSecTime': {'field_length': 3,
	250	'field_offset': 428,
	251	'field_type': 2,
	252	'printable': u'10',
	253	'tag': 37520,
	254	'values': u'10'},
	255	'EXIF SubSecTimeDigitized': {'field_length': 3,
	256	'field_offset': 452,
	257	'field_type': 2,
	258	'printable': u'10',
	259	'tag': 37522,
	260	'values': u'10'},
	261	'EXIF SubSecTimeOriginal': {'field_length': 3,
	262	'field_offset': 440,
	263	'field_type': 2,
	264	'printable': u'10',
	265	'tag': 37521,
	266	'values': u'10'},
	267	'EXIF SubjectDistanceRange': {'field_length': 2,
	268	'field_offset': 692,
	269	'field_type': 3,
	270	'printable': u'0',
	271	'tag': 41996,
	272	'values': [0]},
	273	'EXIF WhiteBalance': {'field_length': 2,
	274	'field_offset': 596,
	275	'field_type': 3,
	276	'printable': u'Auto',
	277	'tag': 41987,
	278	'values': [0]},
	279	'Image DateTime': {'field_length': 20,
	280	'field_offset': 194,
	281	'field_type': 2,
	282	'printable': u'2011:06:22 12:20:33',
	283	'tag': 306,
	284	'values': u'2011:06:22 12:20:33'},
	285	'Image ExifOffset': {'field_length': 4,
	286	'field_offset': 126,
	287	'field_type': 4,
	288	'printable': u'214',
	289	'tag': 34665,
	290	'values': [214]},
	291	'Image Make': {'field_length': 18,
	292	'field_offset': 134,
	293	'field_type': 2,
	294	'printable': u'NIKON CORPORATION',
	295	'tag': 271,
	296	'values': u'NIKON CORPORATION'},
	297	'Image Model': {'field_length': 10,
	298	'field_offset': 152,
	299	'field_type': 2,
	300	'printable': u'NIKON D80',
	301	'tag': 272,
	302	'values': u'NIKON D80'},
	303	'Image Orientation': {'field_length': 2,
	304	'field_offset': 42,
	305	'field_type': 3,
	306	'printable': u'Rotated 90 CCW',
	307	'tag': 274,
	308	'values': [6]},
	309	'Image ResolutionUnit': {'field_length': 2,
	310	'field_offset': 78,
	311	'field_type': 3,
	312	'printable': u'Pixels/Inch',
	313	'tag': 296,
	314	'values': [2]},
	315	'Image Software': {'field_length': 15,
	316	'field_offset': 178,
	317	'field_type': 2,
	318	'printable': u'Shotwell 0.9.3',
	319	'tag': 305,
	320	'values': u'Shotwell 0.9.3'},
	321	'Image XResolution': {'field_length': 8,
	322	'field_offset': 162,
	323	'field_type': 5,
	324	'printable': u'300',
	325	'tag': 282,
	326	'values': [[300, 1]]},
	327	'Image YCbCrPositioning': {'field_length': 2,
	328	'field_offset': 114,
	329	'field_type': 3,
	330	'printable': u'Co-sited',
	331	'tag': 531,
	332	'values': [2]},
	333	'Image YResolution': {'field_length': 8,
	334	'field_offset': 170,
	335	'field_type': 5,
	336	'printable': u'300',
	337	'tag': 283,
	338	'values': [[300, 1]]},
	339	'Thumbnail Compression': {'field_length': 2,
	340	'field_offset': 26280,
	341	'field_type': 3,
	342	'printable': u'JPEG (old-style)',
	343	'tag': 259,
	344	'values': [6]},
	345	'Thumbnail ResolutionUnit': {'field_length': 2,
	346	'field_offset': 26316,
	347	'field_type': 3,
	348	'printable': u'Pixels/Inch',
	349	'tag': 296,
	350	'values': [2]},
	351	'Thumbnail XResolution': {'field_length': 8,
	352	'field_offset': 26360,
	353	'field_type': 5,
	354	'printable': u'300',
	355	'tag': 282,
	356	'values': [[300, 1]]},
	357	'Thumbnail YCbCrPositioning': {'field_length': 2,
	358	'field_offset': 26352,
	359	'field_type': 3,
	360	'printable': u'Co-sited',
	361	'tag': 531,
	362	'values': [2]},
	363	'Thumbnail YResolution': {'field_length': 8,
	364	'field_offset': 26368,
	365	'field_type': 5,
	366	'printable': u'300',
	367	'tag': 283,
	368	'values': [[300, 1]]}}
	369
	370
	371	def test_exif_image_orientation():
	372	'''
	373	Test image reorientation based on EXIF data
	374	'''
	375	result = extract_exif(GOOD_JPG)
	376
	377	image = exif_fix_image_orientation(
	378	Image.open(GOOD_JPG),
	379	result)
	380
	381	# Are the dimensions correct?
	382	assert image.size == (428, 640)
	383
	384	# If this pixel looks right, the rest of the image probably will too.
	385	assert_in(image.getdata()[10000],
	386	((41, 28, 11), (43, 27, 11))
	387	)
	388
	389
	390	def test_exif_no_exif():
	391	'''
	392	Test an image without exif
	393	'''
	394	result = extract_exif(EMPTY_JPG)
	395	clean = clean_exif(result)
	396	useful = get_useful(clean)
	397	gps = get_gps_data(result)
	398
	399	assert result == {}
	400	assert clean == {}
	401	assert gps == {}
	402	assert useful == {}
	403
	404
	405	def test_exif_bad_image():
	406	'''
	407	Test EXIF extraction from a faithful, but bad image
	408	'''
	409	result = extract_exif(BAD_JPG)
	410	clean = clean_exif(result)
	411	useful = get_useful(clean)
	412	gps = get_gps_data(result)
	413
	414	assert result == {}
	415	assert clean == {}
	416	assert gps == {}
	417	assert useful == {}
	418
	419
	420	def test_exif_gps_data():
	421	'''
	422	Test extractiion of GPS data
	423	'''
	424	result = extract_exif(GPS_JPG)
	425	gps = get_gps_data(result)
	426
	427	assert gps == {
	428	'latitude': 59.336666666666666,
	429	'direction': 25.674046740467404,
	430	'altitude': 37.64365671641791,
	431	'longitude': 18.016166666666667}